Metallized walkway surface



Oct. 29, 1929. H. ITH 1,733,471

METALLIZED WALKWAY SURFACE Filed April 3, 1926 2 Sheets-Sheet l I I l i i I E H rmar r i i j/fii 32 BY v uh ATTORNEYS Oct; 29, 1929; SMITH 1,733,471

METALLIZED WALKWAY SURFACE Filed April 3, 1926 ZSheets-Sheet 2 Herman fl. Smif/r 3 W :s

ATTORNEYS Patented Oct. 29, 1929 UNITED STATES PATENT OFFICE.

' HER Aiv H. sivu'rn, on BRO KLYN, NEW iYOR K Mn'rA LrzEn WALKWAY [SURFACE I Application filed April 3,

. of such material by means of a metallic unit embedded directly in the pavement material.

It is a further object to provide an improved metallic unit with means for exposing the pavement material through and around spect to the pavement material'so that further attention will not be required after the unit is once inserted in position in the pavement material. I

It is a further object to provide a metallized walkway surface," composed of a metal unit so designed as to expose a filling material between the bars of the metal unit, the said filling material being composed of elements which will endure'heavy wear, prevent slipping, and fuse firmly with the paving material in which the metallic unitis' embedded.

It is still a further object to provide a particular anchoring element foruse with said unit.

These and other objects will appear 'more fully from the following description when inwhich: p M

Fig. 1 is a plan View of a portion of a tread plate secured in position in a pavement material. g

Fig. 2 is a vertical sectional "view thereof substantially on the line-22 of Fig; 1.

Fig. 3 is a transversesectional View on the line 33 of Fig. 1.

considered in connection withthe drawings Fig. 4 isa perspective view of one ofthe removable anchoring extensions employed.

Figs. 5 and 6 show certain modifications" in the configuration of the tread plate which may be employed.

Fig. 7 shows one adaptation of the invention.

Fig. 8 is a sectional view of a different adaptation of the invention taken substanthe same to firmly anchor the unit with re-' the 1926. I Serial No. 99,454.

tially on the line 88 of Fig. 9, representing the preferred form of unit used for stepsor the like. I

Fig. 9 isaplan view of the structure shown I in Fig. 8, parts being in section. F ig; 10 is a plan view of one form of surface plate which may be employed with curbs. Fig. 11 is a front elevational View of the tread plates shown in Fig. 10.

' Fig. 12 is a vertical sectional view taken on the line 1212 of'Fig. 10; and I 'Fig. 13 is a similar View showing a slight modification of the unit'disclosed in Fig. 12.

Referring first to Figs. 1 to 4 thereis disclosedthe general construction of the tread.

plate-which may be used on stair treads, curbings or the like formed of any preferredpavement material such as concrete. In general in the specification and claims the material forming the'body of 'such' steps or 'curbstone i is referred to as the pavement materiahit being understood that'by this term I mean to identify any material usedin the formation of stair treads or curbstones or other tread units having exposed edges.

Referring to the details of thedrawings, the pavement material indicated generally by the numeral 14 has secured thereon and embedded therein a metallic unit 16 for protecting the upper surface and said edges of;

pavement materialas will appear more fully below. The unit 16in this form of the invention isprovided with a tread portion 18 formed with longitudinal openings 19 through which the pavement material may be exposed substantially flush withthe upper surfaceof thetread portion 18. 'The openings 19 may berelatively long compared with the widthof the same, as indicated for example in Fig. 1, the side edges of the open ings preferably diverging upwardly asshown inFig. 3, to provide a Wedge-shaped body of pavement materialas indicated at 20 for *firmly anchoring the metallic units to the pavement material In some circumstances" as where there is extremely heavy. wear upon the tread portion of the unit, it is preferred to make use of an especially prepared pavement material or cement for filling the open- .ings 19, this cement being laid before'the body of the pavement material 14 has-become firmly set and fusing or merging into the main pavement material 14. The surface of the pavement exposed through the openings 19 as indicated for example at 20 may accordingly be formed of sand, Portland cement and carborundum resulting in an exposed pavem'ent. material which will withstand extremely long wear and havinga high coefficient of friction will be practically nonslipping. The upper surface of theunit 16 and in particular the surface of the tread portion 18 is preferably formed with aseries of depressions or grooves 21 extending lengthwise of the unit between the openings 19 for providing a further anti-skid wearing surface for the unit. 7 The portions of the.

units between the openings 19 form cross-- members 22 for strengthening the units, these cross-portions 22'being apertured as indicated at 23' for receiving the anchoring extensions as described below.

The anchoring extensions indicated generally at 24 are shown as removably secured to the units 16 and to this end are provided with threaded reduced extensions 25 adapted to be threadedly engagedwithin the openings 23 of the units 16. The extensions 24 are provided with body parts 26 forming shoulders 27 for engagement with theun'its 16 and with enlargements 28 at the free portions of the extensions preferably wedgeshaped in form to facilitate the insertion of the anchoring extensions into. the pavement material. The side surfaces of'the body portions 26 preferably taper from the enlarge- Inents 28 to the shoulders 27 the body portion so formed being wedge-shaped for more securely anchoring the extensions in the pavement material. In order to provide for continuity of the. pavement material through as well as around the extensions, they are shown as provided with transverse apertures 30 for receiving the pavement material. The upper surfaces of the enlargements 28 serve to securely anchor the extensions 24 and units 16 inthe pavement material.

While it is preferred toprovide upwardly diverging openings 19 as indicated in Fig. 3, these openings may be formed as shown in a Fi s. 5 or 6, Fig; 5 disclosing the openings as downwardly diverging and in Fig 6 the openings have substatially parallel sides. It

is to be understood that variations in this respect may be accepted without departingfrom my invention.

In Fig. 7 I have shown one use to which the extension 32. forming a corner bead for '65.

the pavement material, the units protecting the top surface and corner or edge of the pavement material.

In Figs. 5, 8 and 9 there is disclosed one of the preferred-forms of my invention in which the tread portion 18 of the unit 16 is formed as disclosed in Figs. 1 to 3 but in which a vertical side extension 34 isprovided for protecting the side surface of the pavement material 14", the unit being embedded in such pavement material as in the first form of the invention. The side extension 34 is preferably apertured as indicated at 19 thus exposing the pavement material through the extension for better anchoring the unit in position. The extensions 34 as well as the tread portions 18 of the units may be provided with anchoring extensions 24 for resisting upward or outward movement of the units with respect to the pavement'material,

.one form of curb protector 16 wherein the tread portion 18 is provided with the apertures 19 as in the fir'st'form of the invention, for exposing a pavement material. The

unit 16 forms in effect an entire cap for protectin'g the upper surface and side edges of the curb. The front edge of the unit, that is, the edge placed adjacent to the street, the surface of which is indicated at 36, ispreferably formed with the enlarged rounded corner 38 terminating in theside extension 34. The extension 34, as shown, has a wedgeshaped point 39 for facilitating the insertion of the unit into theconcreteor other curb 14 while the latter is in a plastic or semiplastic state. The side extension 34 is preferably apertured as indicated at19 for exposing the pavement material as in the other forms of the invention. The rearward surface of the curbstone may be protected and the unitfinore firmly anchored into the material of the curbstone by providing a relatively small rearward extension 40 provided a reduced point 41 for facilitating its introduction into the pavement material and with elongated apertures 19 for exposing the pavement material through the said rearward extension. If desired one or more anchoring extensions 24 maybe secured to each of the units 16 for anchoring them with respect to the pavement material as disclosed full above. V

It will be seen that the upper surface and the proximate side surfaces of the curb pro} vided with the units 16 will be amply pro; tected against injury due to trafiic or other wear on or against the curbstone. This result is attained in part by reason of the continuous or unbroken character of the corners forming;

the junction of the top and side portions of the unit. The units are firmly anchored with respect to the curb by reason of the apertures 19 exposing the pavement material through both side projections 34 and 40 and through the upper surfaces 18, the openings in the upper surfaces 18 receiving a Wed eshaped body of pavement material as in icated. The units 16 are particularly useful for curbings because of the fact that they are substantially of the same width as the curb and can be inserted in position between the sides of the form or mold being used for forming the curb, that is, as soon as the concrete 14 has been poured the units 16 may be inserted in place between the sides of the form for the curb and firmly embedded in the material 14 while the latter is in a plastic or semiplastic state, with the result that the units forin substantially an integral part of the cur In Fig. 13 I have shown a slight modification of curb protector which may be employed, the unit therein disclosed being constructed similarly to that shown in Figs. 10, 11 and 12 except that a projecting bead 4:2 is formed at the edge of the unit adjacent the street side of the curb for preventing the Wheels of vehicles from scraping upon the curb proper. The side extension 34 of the unit disclosed in Fig. 13 is accordingly slightly enlarged relatively to the size of the extension 34; shown in Figs. 11 and 12 and is apertured as indicated at 19 for the purposes given above.

It is to be understood that the pavement material referred to in the specification and claims may be of any preferred type and that the unit is applicable to variations in the specific pavement material utilized. The invention herein disclosed is particularly applicable for met-allizing any type of exposed construction material such as sidewalks, curbstones, steps, Walls, floors, platforms, etc., such materials being indicated generally by the term pavement material.

This invention constitutes an improvement upon the pavement disclosed in my patent No. 1,560,354, reference being had to this patent for the general objects and advantages of the paving unit herein disclosed.

Having now described my invention I desire it to be understood that the embodiments herein disclosed are merely illustrative of the basic principle of the invention and that I am to be limited only as set forth in the claims hereunto appended.

I claim:

1. In combination with a pavement material, a metallic unit adapted to be moulded into said pavement material and formed With a tread portion and an edge extension exposed at the top surface and a side surface respectively of said pavement material and an anchoring extension projecting inwardl from said unit into said pavement materia said anchoring extension being provided with a wedge shaped enlargement near the free end thereof and formed with a re duced inner or forward edge and an out-,

wardly projecting securing shoulder.

2. In combination with a pavement material, a metallic unit adapted to be moulded into said pavement material and formed with a tread portion and'an edge ex-. 

